Cleanup owners files, histograms, src (-ygorshenin@)

WATCHLISTS

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Watchlist Rules
 # Refer: http://dev.chromium.org/developers/contributing-code/watchlists
 
 # IMPORTANT: The regular expression filepath is tested against each path using
 # re.search, so it is not usually necessary to add .*.
 
@@ skipping 816 matching lines @@
                  'rouslan+autofillwatch@chromium.org'],
     'automation': ['robertshield@chromium.org'],
     'base': ['erikwright+watch@chromium.org'],
     'base_allocator': ['dmikurube@chromium.org',
                        'wfh+watch@chromium.org'],
     'base_memory': ['gavinp+memory@chromium.org'],
     'base_win': ['grt+watch@chromium.org', 'wfh+watch@chromium.org'],
     'battery_status': ['timvolodine@chromium.org'],
     'bookmarks': ['noyau+watch@chromium.org', 'tfarina@chromium.org'],
     'browser_chromeos': ['davemoore+watch@chromium.org',
-                         'stevenjb+watch@chromium.org',
-                         'nkostylev+watch@chromium.org'],
+                         'stevenjb+watch@chromium.org'],
     'browser_components': ['browser-components-watch@chromium.org'],
     'browser_compositor': ['vollick@chromium.org',
                            'piman+watch@chromium.org'],
     'browser_resources': ['arv+watch@chromium.org'],
     'browsing_data': ['markusheintz@chromium.org'],
     'bubble': ['alicet@chromium.org', 'msw+watch@chromium.org'],
     'cast': ['avayvod+watch@chromium.org',
              'hclam+watch@chromium.org',
              'hguihot+watch@chromium.org',
              'hubbe+watch@chromium.org',
@@ skipping 209 matching lines @@
                      'mcasas+watch@chromium.org',
                      'posciak+watch@chromium.org'],
     'website_settings': ['markusheintz@chromium.org'],
     'windows_sandboxing': ['wfh+watch@chromium.org'],
     'worker': ['jam@chromium.org'],
     'x11': ['derat+watch@chromium.org',
             'sadrul@chromium.org',
             'yusukes+watch@chromium.org'],
   },
 }